Write the fraction in simplest form. \( \begin{array}{lllll}\text { 8. } \frac{32}{72} & \text { 9. } \frac{6}{21} & \text { 10. } \frac{15}{21} & \text { 11. } \frac{12}{35} & \text { 12. } \frac{28}{48}\end{array} \)

If you applied the divisibility test for 9 to determine whether or not the natural number 24172232 is divisible by 9 , you would check to see if 9 divides what number?

Anine løper ei løype på \( 12,35 \mathrm{~km} \). Inge løper samme løype to ganger. Hvor langt løper de til sammen?

If you applied the divisibility test for 8 to determine whether or not the natural number 304331543091 is divisible by 8 , you would check to see if 8 divides what number?

b) \( (7,521)(4,8)= \)

Bisa and Ibrahim both did their laundry today. Bisa does laundry every 5 days and Ibrahim does laundry every 10 days. How many days will it be until Bisa and Ibrahim both do laundry on the same day again? days